<p>I think photoshop is a good one to have installed on your computer. GIMP is on the other hand a free tool but i recommend using adobe photoshop. I would also like to let you know that the world is now smarter than the past, now you can use <a href="http://www.onlinephotoshop.net">photoshop online</a> which doesn't even need any downloading and installation process.</p>